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Impurities in heavy fermion superconductors

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Ahlheim, U., Vanaken, P., Spille, H., & Steglich, F. (1988). Impurities in heavy fermion superconductors. Helvetica Physica Acta, 61(4), 518-529. doi:10.5169/seals-115957.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-CF93-2
Abstract
Stimulated by the unusual phase diagram of the superconducting states in U]_,.Th,.Bei3 which furnished a renewed debate about the nature of the heavy-fermion superconduct¬ ing order parameter (conventionally anisotropic vs. unconventional), we have initiated a study of the effect of impurities on the superconducting state of CeCu2Si2. We conclude a 'diamagnetic' pair-breaking effect by the non-magnetic impurities La and Y and an additional "paramagnetic" one by Gd. Comparison with low-temperature resistivity results in the normal state leads to the assumption that the Tc — depression for vanishing dopant concentration is determined by a highly anisotropic scattering of the heavy quasiparticles off these impurities.